Champion Spark Plug (RC12YC). The spark plug ignites the fuel and air mixture in the cylinder to power the engine. If the spark plug is burnt, fouled or damaged the engine may not start or may run rough.

Briggs & Stratton flywheel key. The flywheel key aligns the flywheel in the correct position on the crankshaft. If the engine stops suddenly due to hitting a hard object, the flywheel key shears in half to prevent damage to the engine. If the flywheel key is broken, the engine won't start.

Starter motor. When energized, the starter motor's drive gear engages the flywheel to start the engine. (Ensure that the solenoid wire is not being pinched upon installation of the starter, as this will potentially short the circuit)

Carburetor fuel inlet needle. This needle can get stuck if fuel if left inside the carburetor for extended periods of time. Ethanol in the gasoline can cause it to turn into a varnish-like substance and cause the engine to not start.

Genuine OEM Part - Manufacturer #231855S

We recommend using fuel stabilizer to keep your fuel fresh and protect your engine from corrosion.